08 ford f350 diesel battery light came on, shut off engine

Customer Question

08 ford f350 diesel battery light came on , shut off engine and started it up again lite came on after about 2 minutes, checked voltage on the batterys and it was 13.9 voltsJA: Does the light stay on, or does it blink?Customer: stays onJA: What is the model/year of your Ford?Customer: 350 one ton dually 2008JA: What year is your Ford?Customer: 2008JA: Are you hoping to fix this yourself? What have you tried so far?Customer: haven't done anything yet looking for info on it because it appears that the batteries are charging.JA: Anything else you think the mechanic should know?Customer: just that bringing it home after the lite came on checked the voltage at the battery. while engine was running voltage was 13.8 on the left battery and 13.9 on the right so it appears the alternater is working at idle

Hello, when i still charges and has a battery light on, it is usually due to an issue with one of the diodes inside the altenator. Replacement of the altenator would fix this concern. There is a diode trio inside that helps regulate the voltage and when one goes bad, it turns the lamp on.